There is nothing to limit current until opposing magnetic fields build up at generator operating speed-windings will overheat and burn.
In a series DC motor used for traction, the armature rheostat is there to limit the current on starting. In normal running the rheostat is set to zero ohms (maximum power) so that power is not wasted in it. At full speed the power is turned off, the vehicle then coasts along until it's time to stop.
No. If you attempt to reduce the voltage to a cap start motor by using a rheostat, you can destroy the motor.
Rheostat
It is a variable resistance device which control the flow of current
the back emf increases so that high currents doesn't pass through the field windings
the back emf increases so that high currents doesn't pass through the field windings
it is kept at minimum position to produce more torque which is required for starting a motor
how to test a rheostat?
If you are talking about the field rheostat on a generator, once you have the correct voltage output set, it is very unlikely that it has to be touched again. If it is the generator's first start up, then it is best to set the field on the low side so as not to over excite the generator and drive the output voltage higher that what the generator's specifications are rated at. The field excitation voltage does not have to be set at the minimum position on every start up once it is set for the correct output voltage. A good example of this is a hospital standby generator, it starts up with no human intervention needed.
A variable resistor is another name for a rheostat.
First remember this rheostat is connected in series with the armature to increase the total resistance to limit the starting current, thus achieving max starting torque from the motor
It is lost in heating the resistive material of the rheostat.
The hypothesis of a rheostat is that by changing the resistance in a circuit using the rheostat, the current flowing through the circuit can be varied, thus regulating the output of the circuit.
By keeping the prism in minimum deviation position, the RI of the prism can be calculated efficiently.
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